Impact of short-term drought stress on volatile organic compounds emissions from Pinus massoniana
LI Ling-yu1, Alex B. Guenther2, GU Da-sa2,3, Roger Seco2, Sanjeevi Nagalingam2
1. College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China; 2. Department of Earth System Science, University of California, Irvine, California 92697, USA; 3. Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong 999077, China
Abstract To explore the impact of drought on BVOC emissions, dynamic enclosure system and TD-GC-TOFMS were used to conduct laboratory measurements of BVOC emission from Pinus massoniana under short-term drought stress. The changes in emission rates and composition were analyzed quantitatively. The results showed that emission of isoprene was inhibited under drought stress, with a drop of around 50% in emission rate. Monoterpene and sesquiterpene emission rates were enhanced to 137.85 μg/(m2·h) and 0.98 μg/(m2·h) which were 2.9 and 2.0 times as high as those without stress, respectively. Except trans-α-bergamotene, emissions of all the detected monoterpene and sesquiterpene compounds were promoted under drought stress. Those emission rates were 1.3~42.4 times as high as those without stress. Among them, 3-carene emission had the most sensitive response to drought stress, while α-fenchene, α-phellandrene, and trans-caryophyllene had the lowest sensitivity. Under drought stress, the emission compositions of monoterpene and sesquiterpene were changed, but the dominant compounds remained the same. The main components of monoterpene were α-pinene, sabinene, and β-pinene, accounting for 48%, 17%, and 17% in the total monoterpene emissions, respectively. Trans-caryophyllene and longifolene dominated sesquiterpene emissions with contributions of 57% and 34%, respectively.
LI Ling-yu,Alex B. Guenther,GU Da-sa等. Impact of short-term drought stress on volatile organic compounds emissions from Pinus massoniana[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3776-3780.
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